linux-kernel - Re: [PATCH v3 1/2] dt-bindings: iio: adc: ti,ads7038: Add description for ADS7038

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Date:   Mon, 16 Oct 2023 09:18:46 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     werneazc@...il.com, jic23@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        lars@...afoo.de
Cc:     devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andre Werner <andre.werner@...tec-electronic.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: iio: adc: ti,ads7038: Add description
 for ADS7038

On 16/10/2023 09:02, werneazc@...il.com wrote:
> From: Andre Werner <andre.werner@...tec-electronic.com>
> 
> Add basic description for ADS7038 ADC devices.
> The devicetree adds the following device specific options:
> 
> - average-samples: Program device's programmable average filter.
> - crc-enabled: Enable the CRC check for SPI transfers. Sadly, this
>   option has currently no effect in the driver.
> - status-enabled: Enable the appending of the device's status on the
>   measure value transmission.
> - gpio-controller: Sadly function not implemented yet in the driver.
> 
> Signed-off-by: Andre Werner <andre.werner@...tec-electronic.com>
> ---
> v3
> - Delete ADS7138 compatible and comments.
> - Add options for CRC, status and average samples as well as
>   gpio-controller.
> - Update example.
> - add regulator for digital IO voltage.

You received several build errors before. Did you really test it now,
because looks like not.

> ---
>  .../bindings/iio/adc/ti,ads7038.yaml          | 83 +++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
> new file mode 100644
> index 000000000000..fc1054ca93f7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,ads7038.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Texas Instruments ADS7038 and similar ADCs
> +
> +maintainers:
> +  - Andre Werner <andre.werner@...tec-electronic.com>
> +
> +description: |
> +  Family of 7 channel, 12 bit ADCs with SPI interface.
> +
> +  Datasheet: https://www.ti.com/lit/gpn/ads7038
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,ads7038
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 60000000
> +
> +  avdd-supply:
> +    description: Analog supply voltage, also used as the reference voltage to the ADC.
> +
> +  dvdd-supply:
> +    description: Digital I/O supply voltage.
> +
> +  average-samples:
> +    description: |
> +      If specified ADC is configured for avaraging measurements (OSR_CFG Register).
> +      This effects output format for measurement and sampling time.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3, 4, 5, 6, 7]
> +
> +  status-enabled:
> +    description: |

Do not need '|' unless you need to preserve formatting.

> +      If specified ADC transmits chip status (DATA_CFG Register).

Missing type.

You described the desired Linux feature or behavior, not the actual
hardware. The bindings are about the latter, so instead you need to
rephrase the property and its description to match actual hardware
capabilities/features/configuration etc. Why this is a property of a board?

> +
> +  crc-enabled:
> +    description: |
> +      Checking the integrity of the data bits exchanged over
> +      SPI interface (GENERAL_CFG Register).

Same comment.



Best regards,
Krzysztof